Swipe event indicates that user performed a swipe gesture such as
dragging a finger in one direction on touch screen.

Unlike some other gestures, the swipe gesture is not continual - the whole
gesture produces only one event. The event is delivered to the top-most
node picked on the gesture coordinates.

The swipe gesture has four types according to the movement direction.
The gesture can be performed by any number of touch points, the number
is provided by getTouchCount() method.

Note that swipe and scroll gestures are not exclusive. A single touch screen
action can result in both gestures being delivered.

Note that the capability to produce swipes is dependent on the used input
devices and underlying platform's capabilities and settings (especially
without touch-screen user's possibilities of producing swipes are
significantly reduced).

As all gestures, swipe can be direct (performed directly at
the concrete coordinates as on touch screen - the center of the gesture
is used as gesture coordinates) or indirect (performed
indirectly as on track pad - the mouse cursor location is usually used
as the gesture coordinates in this case).